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Synthesis and magnetic properties of octahedral ferrite NiχCo1−χ Fe2O4 nanocrystals

100%

Kasapoglu N., Birsöz B., Baykal A., Köseoglu Y., Toprak M.

Open Chemistry

2007

vol. 5

issue 2

570-580

A series of Ni doped cobalt ferrite compounds with the formula Niχ Co1−χ Fe2O4 where x=0, 0.2, 0.4, 0.6, 0.8, and 1.0 were prepared using a hydrothermal method and subsequently sintered/annealed at 600 °C for 3 h. The influence of the Ni content on the lattice parameter, a, stretching vibration and the magnetization of specimens were subsequently studied. XRD and FTIR were used to investigate structure and composition variations. All samples were found to have a cubic spinel structure. SEM was used to study morphological variations. The results indicate that the average particle sizes are between 30–35 nm with a narrow size distribution along with nanocrystals forming of regular octahedrons. A decrease in the peak to peak line width and increase in resonance field with increasing Ni content were observed from ESR measurements. Based on ESR results, a core-shell type of formation was proposed where the core is made up of undoped CoFe2O4 and the shell is Ni2+ doped CoFe2O4. [...]

Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films

63%

Belous A., Tovstolytkin A., Solopan S., Shlapa Y., Fedorchuk O.

Acta Physica Polonica A

2018

vol. 133

issue 4

1006-1012

The work highlights peculiar features of synthesis and summarizes important properties of nanoparticles and films based on two types of oxide magnets: with spinel and perovskite-type structures. The attention is drawn to the differences in the processes underlying the formation of crystalline phase in the materials of each group. It is shown that for the spinels, the formation of weakly agglomerated crystalline nanoparticles can occur in the process of synthesis, but for the perovskite-like magnets, the formation of crystalline nanoparticles requires additional high-temperature treatment. It is demonstrated that synthesized nanoparticles and films may find wide practical applications, particularly as the heat mediators in hyperthermia treatment therapy, as components of left-handed media, ferroelectric-ferromagnetic layered structures and composite microwave resonators. They also may be used as integral parts of composite structures, which possess magnetic-field-controlled properties and display giant magnetocaloric effect.

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1 Acta Physica Polonica A

1 Open Chemistry

1 2018

1 2007

1 Baykal A.

1 Belous A.

1 Birsöz B.

1 Fedorchuk O.

1 Kasapoglu N.

1 Köseoglu Y.

1 Shlapa Y.

1 Solopan S.

1 Toprak M.

1 Tovstolytkin A.

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Synthesis and magnetic properties of octahedral ferrite NiχCo1−χ Fe2O4 nanocrystals

Synthesis, Properties and Applications of some Magnetic Oxide Based Nanoparticles and Films